Abstract
A novel CoS@Fe3O4@rGO aerogel with a unique 3D porous heterostructure was prepared via the solvothermal method, in which cobalt sulfide (CoS) microspheres embedded with Fe3O4 nanoparticles were randomly scattered on reduced graphene oxide (rGO) flakes. The introduction of magnetic Fe3O4 nanoparticles and rGO regulated the impedance matching, and the excellent electromagnetic wave (EMW) absorption capability of the CoS@Fe3O4@rGO aerogel could be attributed to optimal dielectric loss and abundant conductive networks. The results demonstrated that the minimum reflection loss (RL) value of CoS@Fe3O4@rGO aerogel was −60.65 dB at a 2.5 mm coating thickness with an ultra-wide bandwidth of 6.36 GHz (10.24–16.6 GHz), as the filler loading was only 6 wt%. Such a lightweight CoS@Fe3O4@rGO aerogel with an outstanding absorbing intensity and an ultra-wide effective absorption bandwidth could become a potential EMW absorber.
Highlights
In recent years, wireless communication technology and radar detection have been widely used in daily life and military fields [1,2]
With a lot of attention being paid to the increasing pollution of serious electromagnetic waves (EMWs), high-performance absorbing materials have come into people’s field of vision, which have the characteristics of lightweight, strong absorption, broad absorption bandwidth, thin matching thickness, and so on [3,4,5]
The characteristic diffraction peaks located at 2θ = 18.34◦, 30.09◦, 35.35◦, 37.03◦, 43.08◦, 53.30◦, 56.77◦, and 62.43◦ are consistent with the (111), (220), (311), (222), (400), (422), (511), and (440) planes, respectively, which reveals the formation of the spinel Fe3 O4 (JCPDS no. 19-0629) [34]
Summary
Wireless communication technology and radar detection have been widely used in daily life and military fields [1,2]. With a lot of attention being paid to the increasing pollution of serious electromagnetic waves (EMWs), high-performance absorbing materials have come into people’s field of vision, which have the characteristics of lightweight, strong absorption, broad absorption bandwidth, thin matching thickness, and so on [3,4,5]. According to reports in recent years, common wave-absorbing materials include ferrites [8], carbon nanomaterials [9], conductive polymers [10], and transition metal oxides [11]. EMW-absorbing materials and has been widely studied [12,13,14,15,16,17]. With its unique nanostructure and good magnetic loss properties, Fe3 O4 shows great EMW absorption potential; defects such as easy corrosion, high density, and narrow absorption frequency band seriously limit its practical application
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